This is a very detailed video on how to remove your "SET" valve on your Suzuki GSX-R.

Suzuki SET or (Suzuki Exhaust Tuning) is a device fitted to Suzuki motorcycle engines that constinuously adjusts the back pressure within the collector of the exhaust system to enhance pressure wave formation as a function of engine rpm. This ensures good low to mid-range performance.

This valve is claimed to give back pressure during low rpm's and open full when going fast. Other people think it's for emissions and it robs horsepower.

With this removed you will have better smoother throttle and a possible 2+ more horsepower!